U3d-L5 December 9, 2009 DRILL Sketch the pictures below and answer the questions: Which lever would be easier to push down, A or B? Which load will travel.

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Presentation transcript:

U3d-L5 December 9, 2009 DRILL Sketch the pictures below and answer the questions: Which lever would be easier to push down, A or B? Which load will travel the greater distance, A or B? A B

SIMPLE MACHINES LEVER INCLINED PLANE U3d-L5 SIMPLE MACHINES Principle: a law of nature underlying the working of an artificial device Simple machines work on 2 basic principles: LEVER INCLINED PLANE

LEVERS Which class is the lever below? Describe it. SECOND CLASS U3d-L5 LEVERS Which class is the lever below? Describe it. THIRD CLASS SECOND CLASS FIRST CLASS

Examples? HOMEWORK REVIEW U3d-L5 HOMEWORK REVIEW With a new partner, go over your solutions to the homework. Are the sketches accurate? Is the class identification correct? Examples?

PRINCIPLE OF THE LEVER WHEEL-and-AXLE A shaft attached to a disk U3d-L5 PRINCIPLE OF THE LEVER WHEEL-and-AXLE A shaft attached to a disk

2nd Class PRINCIPLE OF THE LEVER WHEEL-and-AXLE Which class of lever? U3d-L5 PRINCIPLE OF THE LEVER WHEEL-and-AXLE Which class of lever? 2nd Class

3rd Class PRINCIPLE OF THE LEVER WHEEL-and-AXLE Which class of lever? U3d-L5 PRINCIPLE OF THE LEVER WHEEL-and-AXLE Which class of lever? 3rd Class

1st Class PRINCIPLE OF THE LEVER PULLEYS U3d-L5 PRINCIPLE OF THE LEVER PULLEYS Pulleys are grooved wheels attached to an axle. Generally, what class lever do they act as? 1st Class

FORCE/DISTANCE MULTIPLIERS U3d-L5 PRINCIPLE OF THE LEVER FORCE/DISTANCE MULTIPLIERS Simple Machines can be: Force Multiplier: Increases the force applied to the work at hand Distance Multiplier: Increases the distance the load moves

FORCE/DISTANCE MULTIPLIERS U3d-L5 PRINCIPLE OF THE LEVER FORCE/DISTANCE MULTIPLIERS From the drill: Which is the force multiplier? In other words, which arrangement gives you greater strength A B

FORCE/DISTANCE MULTIPLIERS U3d-L5 PRINCIPLE OF THE LEVER FORCE/DISTANCE MULTIPLIERS From the drill: Which is the distance multiplier? In other words, which arrangement gives you greater distance A B

FORCE/DISTANCE MULTIPLIERS U3d-L5 FORCE/DISTANCE MULTIPLIERS Use the following information to determine the force required to lift the load using a 1st class lever. L = 100 lbs. Draw Sketches! DL = 5 ft. 5 ft. 20 ft. DF = 20 ft. F = ???? F = ? 100 lbs.

FORCE/DISTANCE MULTIPLIERS U3d-L5 FORCE/DISTANCE MULTIPLIERS 5 ft. 20 ft. Write your equation Substitute values Solve for unknown F = ? 100 lbs. L x DL = F x DF 100 lbs x 5 ft = F x 20 ft 500 ft-lbs = F x 20 ft 20 ft 20 ft F = 25 lbs.

FORCE/DISTANCE MULTIPLIERS U3d-L5 FORCE/DISTANCE MULTIPLIERS Use the following information to determine the force required to lift the load using a 1st class lever. L = 200 lbs. DL = 10 ft. 10 ft. 20 ft. DF = 20 ft. F = ???? F = ? 200 lbs.

FORCE/DISTANCE MULTIPLIERS U3d-L5 FORCE/DISTANCE MULTIPLIERS Use the following information to determine the force required to lift the load using a 1st class lever. L = 100 lbs. DL = 20 ft. 20 ft. 20 ft. DF = 20 ft. F = ???? F = ? 100 lbs.

FORCE/DISTANCE MULTIPLIERS U3d-L5 FORCE/DISTANCE MULTIPLIERS Use the following information to determine the force required to lift the load using a 2nd class lever. L = 100 lbs. 10 ft. DL = 5 ft. 5 ft. DF = 10 ft. F = ???? F = ? 100 lbs.

FORCE/DISTANCE MULTIPLIERS U3d-L5 FORCE/DISTANCE MULTIPLIERS Write your equation Substitute values Solve for unknown 10 ft. 5 ft. L x DL = F x DF 100 lbs x 5 ft = F x 10 ft F = ? 100 lbs. 500 ft-lbs = F x 10 ft 10 ft 10 ft F = 50 lbs.

FORCE/DISTANCE MULTIPLIERS U3d-L5 FORCE/DISTANCE MULTIPLIERS Use the following information to determine the force required to lift the load using a 2nd class lever. L = 200 lbs. 25 ft. DL = 15 ft. 15 ft. DF = 25 ft. F = ???? F = ? 200 lbs.